Improvement in steam generators



J. A. MILLER.

STEAM GENERATOR.

Patented Feb. 26, 1867.

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Letters Patent No. 62,494, dated il 'ciirzmr z JG, 1867.

, IMPROVEMENT IN STEAM .GENERATORS.

TO ALL WHOM; IT MAY.- oonosnn;

Be it known that L'iIOSl-IPH A. MILLER, of the city, county, and Stateof New York, have inventeda certain,

new and useful Improvementin Steam Boilers,lof which the following is afull, clear, and exact description, reference being bad to theaccompanying drawing marked B, i'orining part of this specification, andin which-- Figure 1 represents a-"transverseseotion of a double boilerhaving my improvement applied to it, taken as indicated by the line I :vin 2.

Figure 2, a longitudinal section of the sam in part, taken as denotedby-the line m m in fig. 1; and.

Figures 3, 4, and 5, transverse, sections on an enlarged scale of theboxes, pipes, or tubes, arranged round or oneither side of the fire-boxor chamber, under different foruis of construction,

Like letters indicate like parts throughout the several figures.

The nature of this invention consists in a combination, with one or moreboilers or steam generators of cylindrical or other form, -zirr anged toproject horizontally over a tire box or chamber, and having the heatapplied directly thereto, or along it, of a series of pipes or boxesarranged on either side of the boiler furnace, and so constructed thatwhile their lower part is below the fire grate, and their upper partabovelt-he water level of the boiler, and said pipes or boxes connectedby a branch or branches with the steam and water spaces of the boiler orboilers, their interior is divided vertically by diaphragms into innertubes or boxes, open at their ends, forming thin 01' contracted waterand steam-generating spaces on either or both sides, reaching from apoint/at or near the line of the fire-grate to the water level of theboiler, or thereab outs; and constituting on the opposite sides ofthediaphragms return-water spaces or ducts.

Referring to the accompanying drawing, A A are horizontal cylindricalboilers arranged parallel to h other, and of which there may be one,two, or more.- These :boilers are of any desired length and diameter,and

set in suitable brick-work, ll. 0 C are the grates; D D tlr; fire-boxesor chambers, provided with doors I) and ash-pits F. G- G are the bridgesat ,back of thegrates, and l-I H steam domes on or to the boilers A A.The sides of the fire-chambers D D are made up of aseries ci ivertically arranged boxes or pipes, I, in close prox. imity to eachother, and connecting or forming part with, at their ends, horizontal.boxes or pipes JK, the lowe ones, J, of which lie below the line of thefire-grates, while the upper ones, K, are arrangedjust above, orthereabouts, the water level of theboilers A A, the former constitutingwater and the latter steam spaces, and being connected respectively byany suitable pipes,'b, with the steam and water spaces of the boilers AA. These boxes or pipes I and J K may be of any desired shape in theirtransverse'sections, not being necessarily cyli drical as hererepresented. The vertical pipes I also may be variously constructed, sofar as regards the internal arrangement and form of a vertical diaphragmor diaphragms, c, are concerned. The main object of these diaphragms inthe pipes I i to-isolate the water in a thin film or sheet in proximityto the fire-chambers or heating surfaces of said pipes, the diaphragrns0 extending from points at or near the line of the fire-grates to thewatcr levcl, or thereabouts, in the boilers A A, andforming distincttubes or passages, olv e; the ones dot which'are open at both ends.These passages d constitute steam generators proper, the fire actingupon them, to the exclusion of the other passages, c, to rapidly convertinto steam the thin film of water contained in and circulating u],wardly through them, and the steam formed at their tops freely passingoff into the steam space without having to work its way through asuperincumbent body of water, while the other passages a, connecting asthey do with the lower horizontal tubes J below the fire-grate, will becomparatively or wholly free from generating steam, and wiliserve.aswater ducts to return any water that may be lifted up by the steamgenerated-by or in-the smaller passages (Z, thereby keeping the steamenterin'gthe tubes K free from water, and by such steam, which israpidly evolved, mixing with the vapor in the boilers A A, renderingdryer the steam in the latter.

What I claim as'my invention, and desire to secure by Letters Patent, is

The boilers A A, one or more (if-them, their fire-chambers D, andthebo'xes or pipes I, with their diaphragms,formingsteanngcncrating,spaces (Z, and return-water.passages e,nnd pipesor boxes JK, when arranged in relation to each other and to thefire-grate, also to the steam and water spaces of the boiler or boilers,and in communication with the latter, substantially as specified:

JOSEPH A. MILLER.

Witnesses:

A. LE CLEiw, G. W. Benn,

